diff --git a/conftest.py b/conftest.py
index 4b9f1f0..0c4d494 100644
--- a/conftest.py
+++ b/conftest.py
@@ -4,10 +4,9 @@
 
 
 @pytest.fixture(autouse=True)
-def add_libraries(doctest_namespace):
-    print(abjad, abjad.__version__)
+def inject_abjad_into_doctest_namespace(doctest_namespace):
+    """
+    Inject Abjad and Nauert into doctest namespace.
+    """
     doctest_namespace["abjad"] = abjad
     doctest_namespace["nauert"] = nauert
-    # doctest_namespace["f"] = abjad.f
-    # doctest_namespace["Infinity"] = abjad.mathtools.Infinity()
-    # doctest_namespace["NegativeInfinity"] = abjad.mathtools.NegativeInfinity()